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Old 01-04-2009, 05:23 PM
babymog's Avatar
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Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
M104 / E 320 questions.

'94 E 320

First question: How many wire harnesses are there on the engine? The main harness running to the sensors and such is nice and fresh, cut into the wrap in several places to verify. On one of my cars however, there is some degradation to the wires going to the starter. I'm also reading about a different harness to the throttle (which I have not verified is new). Are they usually all replaced at the same time?

Second question: If I have a malfunction of the electronic throttle such that it goes into "limp-home" mode, will the cruise control function?

The reason I ask the second question is I have two '94 E 320s, one with ASR and one without. The ASR car seems to have a very linear feel to the throttle where the non-ASR car seems to be a bit touchy. Further, on the non-ASR car, when you push the pedal down (with cruise on), you can feel where you start to open the throttle in additional resistance to moving the pedal at the point where you accelerate off of the cruise setting. On the ASR car, you can't feel it in the pedal.

Both cars' cruise-controls work flawlessly, no error codes, but the non-ASR car's throttle feel seems more like a cable-operated throttle.


Gone to the dark side

- Jeff
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Old 01-05-2009, 09:25 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The engine has 2 wiring harnesses. Main harness to sensors, coils, & injectors.

And the lower harness to the starter & oil level sensor.

ON the non ASR car, the cable is connected to the throttle butterfly.
On the ASR car the cable connects to linkage on the throttle actuator & operates a potentiometer that tells the EA/CC/ISC computer how far to open the throttle. (motor & clutch)
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Old 01-05-2009, 12:30 PM
babymog's Avatar
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Join Date: Jan 2006
Location: Northeast Indiana
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Thank you.

I thought that the non-ASR car also used the electronic throttle, and that the cable was only for limp-home mode, thus my confusion.

Gone to the dark side

- Jeff
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Old 01-05-2009, 02:45 PM
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Location: Phoenix
Posts: 3,726
Sounds like you might need to lubricate the non-ASR throttle linkage.
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